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Pennsylvania colony governor William Penn ordered colonists to conserve one tree for every five cut down.
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Congress passed the Burton Act, which preserved Niagara Falls from hydroelectric power facilities.
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Heavy smog conditions forced city officials to close schools in Los Angeles for most of the month of October.
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The Antarctic Treaty protected Antarctica from the dumping of nuclear waste.
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Rachel Carson published Silent Spring, which warned about the dangers of pesticides, especially DDT.
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Congress passed the first Clean Air Act, which regulated air pollution and emissions.
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The first Earth Day was celebrated by 20 million people across the country. Today, Earth Day is celebrated annually around the world.
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Congress passed the Safe Drinking Water Act to be administered by the EPA, protecting Americans from contaminated drinking water.
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NASA warned the government about Global Warming.
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Live Earth concerts around the world featured Madonna, the Black Eyed Peas, the Red Hot Chili Peppers, Metallica, and the Beastie Boys, to raise awareness of climate change.
